Well, everything will depend on how their new coach will be. Will the new coach obtained be suitable for the Inter Milan squad or not? And if you are lucky, Inter Milan could indeed become stronger, as we saw with Barcelona and Liverpool who actually became champions in their domestic leagues after changing coaches.
And regarding Napoli, I am also quite sure that Napoli will remain the strongest candidate to win the title again in Serie A next season. Because I read the news that Antonio Conte was not leaving. Napoli seems to have succeeded in convincing Antonio Conte to continue coaching Napoli.
(Sourch: https://www.borneoglobe.com/olahraga/102815262726/resmi-antonio-conte-batal-hengkang-ini-janji-rahasia-napoli-agar-sang-pelatih-bertahan#google_vignette)And I think Napoli will develop even more under the coaching of Antonio Conte.
I'm pretty sure Inter Milan will really have difficulty getting a new coach who is expected to be better than Simone Inzaghi. Moreover, Inter Milan now has to move quickly because Inter Milan also has to immediately prepare their team to compete in the Club World Cup. So we can say that Inter Milan currently really has very little time to prepare for an important match. And unfortunately this club had to lose their coach. And the process of getting a new coach I think will take time. Moreover, the new coach and the club will have to adapt and face a transition period. And with the match schedule that awaits, this team must immediately adapt to the new coach. I can only wish Inter Milan the best.
Napoli will still be the favorite even next season. Especially with several quality new players that Napoli has managed to get at this time. And other teams that should be competing with Napoli are now facing difficult times. Like Inter Milan, which has just been reported to have lost their coach, there is certainly a lot of uncertainty about what will happen to Inter Milan if they don't move quickly and find a better replacement coach.
Maybe next season AC Milan can become a new challenger even though this season they failed, but with Allegri coming there I feel AC Milan will rise quickly and maybe compete with Napoli next season. Because AC Milan is now also preparing a better team with its new coach, Allegri.